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this light is useful for carvers of delicate work. [Footnote 5: For
the same reason a window thus constructed would be convenient for an
illuminator or a miniature painter.]
[Footnote: M. RAVAISSON in his edition of the Paris MS. A remarks on
this passage: "La figure porte les lettres f et g, auxquelles
rien ne renvoie dans l'explication; par consequent, cette
explication est incomplete. La figure semblerait, d'ailleurs, se
rapporter a l'effet de la reflexion par un miroir concave." So far
as I can see the text is not imperfect, nor is the sense obscure. It
is hardly necessary to observe that c d here indicate the wall of
the room opposite to the window e and the semicircle described by
f g stands for the arch of the sky; this occurs in various
diagrams, for example under 511. A similar semicircle, Pl III, No. 2
(and compare No. 149) is expressly called 'orizonte' in writing.]
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19.
That the light should fall upon a picture from one window only. This
may be seen in the case of objects in this form. If you want to
represent a round ball at a certain height you must make it oval in
this shape, and stand so far off as that by foreshortening it
appears round.
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20.
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